Pneumatic apparatus



Sept; 16,1924. j 1,508,654

S. E. HALES PNEUMATIC APPARATUS Filed Feb. 14 1923 41 j i V @l I ventor, e Sidney Bales Hales l l I By his Attorneyg, I

am lg m, M g I a UNITED STATES .rA'rsurorslcsq Application fled 14 1928. I lerlal Io. 618,284.

and tube and that the tube is also prevented To all whom it may comem:

Be it known that I, Smmzr Ems-Hams, a subject of the King of Great Britain, residing at 122 Thanet House, Thanet Street, King s Cross, London, England, have invented new and useful Im rovements in Pneumatic Apparatus, of which the followin is a specification.

his invention relates to improvements in pneumatic jacks, shock absorbers or the like of the type comprising a piston and cylinder one another.

adapte to move or be moved relatively to In ca ing out my invention 1 emplloy a known cm of packing comprising a ex- 1521.; tube doubled back and rolling over it- In a jack or shock absorber constructed according to my invention I referably employ a length of plain tube, 1. e., a piece of tubing not having-enlarged or otherwise special] sha (1 ends to' form apackin be-.

i P g tween' t e piston. and cylinder, or alternatively, that end of the tube which is to be,

attached to the piston maybe incurved. 1

An air tight oint between the tube and I piston is made by a plate which presses the tube on to the end of the piston and is so an form a guide. The other end of the c lind'er and'may convenientlybe secured t ere'to b a binding of string, wire or other like flexi le material. 7 a I In order to relieve the tube of bursting pressure as much as possible, an outer sleeve or casing is provided to confine that part of the tube which projects beyond the cylinder.

Preferably this sleeve or casing is -in- 'is positloned at its lower end by a flan d mturn valve.

Shifted as to slide freely in the cylinder.

be admitted to from comin into contact with the open end of the cylin er.

In the accompanyin drawings which illustrate my invention, i re 1 is a vertical section, Fi re 2 is a p an, and Figures 3nd 4 are detail views showing the flexible tubein the open and nipped position.

' 1 is a base plate havi secured thereto preferabl by razin a fianged ring2- to which is razed or at erwise secured a steel tube 3 forming a cylinder'containing a pisthe open end of the cylinder 3 and is secured thereto by a binding 9 of string or wire. 10 is a tube containing a filling piece of wood 11 whichis clamped between a plate 12 and the late 6 by nuts 13 on the studs 8. The filllllg piecell is provided with a liner 11" adapted to receive a tube 14 to the top of which is secured a head 15. The tube 14 is provided with a series of holes 16 to enable. it to be adjusted as to height by raising or lowering it and passm through a suitable hole 161: pin 16 whic rests upon the plate 12. 17 18 a sleeve, or casing'which surrounds-the flexible tube 5 and confines that art of it which projects beyond the cylin er 3 when the plston is raised thus relieving the tube as much as possible of bursting strain. The sleeve 17 ring 18 riveted to the base plate 1 and s 1dably engagss at its upper end" with a flanged ring 19 w ich forms a guide for the tube 10. The ring 19 is connected to the .base

19 has also secured to it a strip 22 the end of which is bent over to secure a in 23 which engages holes in a plate 24 w ich is U shaped in cross section. The base plate 1 is provided with an upturned rojection 25 the outer'surface of which is m contact with or close to the'lower part of the inner surface of the plate 24. 26 is a stop provided on the projection 25 and adapted to limit the travel of the plate 24. Air under pressure can be admitted to the interior of the cylinder 3 through a flexible tube 27 connected to a pump or other source of supply, and passing through holes in the plate 24 and projection 25'which holes normally are in alinement. The tube 27 is connected to anipple 28 screwing into the. flanged ririg 2 and cylinder 3.

n operation when air under pressure is admitted to the interior of the cylinder 3, the flanged plate 4: and the other parts of the piston are raised, the flexible tube 5 rolling over itself. Should air under pressure continue to be supplied to the interior of the cylinder for such a time as to force the piston to exceed its normal travel the flanged plate 4 will force the flexible tube 5 against the flanged ring 19 and straighten out the bend in the flexible strip 20. This movement of the flanged ring 19 will at the same time, through the strip 22, raise the under pressure suitable for the load or weight of the vehicle.

What I claim is:-

1. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube packing and a plate which clamps one end of the acking on to the piston to form an air tig t joint between the piston and cylinder and whose outer periphery makes contact with the cylinder and guides. the piston. 2. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube packing doubled over the open end of the cylinder, means for securing one end of the flexible tube to the cylinder and an outer sleeve adapted to confine the tube.

3. In pneumatic apparatus the combinationof a cylinder, 8. piston, a flexible tube packing doubled over the open endof the cylinder, means for securing one end of the flexible tube to the cylinder, an outer sleeve adapted to confine the tube, and a flange supported by the sleeve forming a guide for the piston. r

r 4. In pneumatic apparatus the combination of a cylinder, :1 piston, a flexible tube packing doubled over the open end of the cylinder, means for securing one end of the flexible tube to the cylinder, an outer sleeve adapted to confine the tube, and a flan e supported b the sleeve which forms a e for and limits the travel of the gm iston.

5. In pneumatic apparatus t e combination of a cylinder, a piston, a flexible tube packing-doubled over and secured to the 0 en end of the cylinder, an outer sleeve a apted to confine the tube, an inlet to the cylinder and means for automatically closing the inlet at the end of the piston stroke.

6. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube packing doubled over and secured to the open end of the cylinder, an outer sleeve adapted to confine the tube, an inlet to the cylinder, means actuated by the piston for closing the inlet at the end of the piston stroke. Q

7. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube packing, a plate which clamps one end of the packing on to the piston to form an air tight joint between the piston and cylinder and also guides the piston in the cy1inder,'a head carried by the piston and meansfor adjusting the height of the head relatively to the piston.

8. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube packing which is doubled over the open end of the cylinder, means forsecuring one end of the flexible tube to the cylinder, and a plate which clamps the other end of the exible tube to the piston to form an air tight joint between the piston and cylinder and whose outer periphery makes contact with the cylinder and guides the piston..

9. In pneumatic apparatus the combination of a cylinder, 9. piston, a flexible tube packing which is doubled over the open end of the c linder, means for securing one end 'of the exible tube to the cylinder, a plate which clamps the other end of the flexible tube to the piston to form an'air tight joint between the piston and cylinder and also guides the piston in the cylinder, and .an outer sleeve adapted to confine the tube.

10. In pneumatic apparatus the combination of a cylinder, a piston, a flexible tube pacln'ng which is doubled over the open end of the c linder, means for securing one end of the exible tube to the cylinder, 8. plate which clamps the other end of the flexible tube to the piston to form an air tight joint betweenthe piston and cylinder and whose outer periphe makes contact with the cylinder and gui es the piston, an outer sleeve adapted to confine the tube, and a fl su ported by the sleeve forming a secon gui V e or the piston.

11. In pneumatic apparatus the combinawhich clamps the other end of the flexible tube to the piston to'form an air tight joint between the piston, and cylinder and also guides the piston in the cylinder, an outer' s eeve adapted to confine thetube and a' flange supported by' the sleeve which forms e second guide for and limits the travel of the piston. y

12. In pneumatic ap status the combination of a cylinder, a iston, a flexible tube packing which is doub ed over the open end of the c linder, means for securing one end of the exible tube to the ciylinder, a plate which clamps the other en of the flexible tube to the piston to form an air tight joint between the piston and cylinder 'and also guides the piston in the cylinder, an outer. sleeve adapted to confine the tube, aninlet to confine e tube, a. ring slidably mounted on said outer sleeve and ada to be moved by the iston at the end 0 its stroke, an inlet to e cylinder, and means actuated thesaid ring for closing the at the en 80 ofthe piston stroke. I

In testimony that I' claim the foregoing as my invention I have n my name this 11th day of January, 1

SIDNEY EALES HALES.

the piston 8 linder, an outer sleeve adapted to 8 I 

